290 lines
9.3 KiB
Python
290 lines
9.3 KiB
Python
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"""
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Extension for rendering beams in 2D optics with Inkscape
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"""
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from __future__ import annotations
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from dataclasses import dataclass
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from functools import singledispatchmethod
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from typing import Iterable, Optional, Final
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import inkex
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from inkex.paths import Line, Move
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import raytracing.material
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from desc_parser import get_optics_fields
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from raytracing import Vector, World, OpticalObject, Ray
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from raytracing.geometry import CubicBezier, CompoundGeometricObject, GeometricObject
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from utils import pairwise
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@dataclass
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class BeamSeed:
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ray: Optional[Ray] = None
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parent: Optional[inkex.ShapeElement] = None
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def get_unlinked_copy(clone: inkex.Use) -> Optional[inkex.ShapeElement]:
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"""Creates a copy of the original with all transformations applied"""
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copy = clone.href.copy()
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copy.transform = clone.composed_transform() * copy.transform
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copy.style = clone.specified_style()
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copy.getparent = clone.getparent
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return copy
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def get_or_create_beam_layer(parent_layer: inkex.Layer) -> inkex.Layer:
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for child in parent_layer:
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if isinstance(child, inkex.Layer):
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if child.get("inkscape:label") == "generated_beams":
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return child
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new_layer = parent_layer.add(inkex.Layer())
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new_layer.label = "generated_beams"
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return new_layer
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def plot_beam(beam: list[Ray], node: inkex.ShapeElement, layer: inkex.Layer):
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path = inkex.Path()
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if beam:
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path += [Move(beam[0].origin.x, beam[0].origin.y)]
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for ray in beam:
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p1 = ray.origin + ray.travel * ray.direction
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path += [Line(p1.x, p1.y)]
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element = layer.add(inkex.PathElement())
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# Need to convert to path to get the correct style for inkex.Use
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element.style = node.specified_style()
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element.path = path
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class Raytracing(inkex.EffectExtension):
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"""Extension to renders the beams present in the document"""
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# Ray tracing is only implemented for the following inkex primitives
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filter_primitives: Final = (
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inkex.PathElement,
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inkex.Line,
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inkex.Polyline,
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inkex.Polygon,
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inkex.Rectangle,
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inkex.Ellipse,
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inkex.Circle,
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)
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def __init__(self):
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super().__init__()
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self.world = World()
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self.beam_seeds: list[BeamSeed] = list()
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def effect(self) -> None:
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"""
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Loads the objects and outputs a svg with the beams after propagation
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"""
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# Can't set the border earlier because self.svg is not yet defined
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self.document_border = self.get_document_borders_as_beamdump()
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self.world.add(self.document_border)
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filter_ = self.filter_primitives + (inkex.Group, inkex.Use)
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for obj in self.svg.selection.filter(filter_):
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self.add(obj)
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if self.beam_seeds:
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for seed in self.beam_seeds:
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if self.is_inside_document(seed.ray):
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generated = self.world.propagate_beams(seed.ray)
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for beam in generated:
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try:
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new_layer = get_or_create_beam_layer(
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get_containing_layer(seed.parent)
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)
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plot_beam(beam, seed.parent, new_layer)
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except LayerError as e:
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inkex.utils.errormsg(f"{e} It will be ignored.")
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@singledispatchmethod
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def add(self, obj):
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pass
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@add.register
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def _(self, group: inkex.Group):
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for child in group:
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self.add(child)
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@add.register
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def _(self, clone: inkex.Use):
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copy = get_unlinked_copy(clone)
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self.add(copy)
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for type in filter_primitives:
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@add.register(type)
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def _(self, obj):
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"""
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Extracts properties and adds the object to the ray tracing data
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structure
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"""
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material = get_material(obj)
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if material:
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if isinstance(material, BeamSeed):
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for ray in get_beams(obj):
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self.beam_seeds.append(BeamSeed(ray, parent=obj))
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else:
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geometry = get_geometry(obj)
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opt_obj = OpticalObject(geometry, material)
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self.world.add(opt_obj)
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def get_document_borders_as_beamdump(self) -> OpticalObject:
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"""
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Adds a beam blocking contour on the borders of the document to
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prevent the beams from going to infinity
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"""
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c1x, c1y, c2x, c2y = self.svg.get_viewbox()
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contour_geometry = CompoundGeometricObject(
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(
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CubicBezier(
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Vector(c1x, c1y),
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Vector(c1x, c1y),
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Vector(c2x, c1y),
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Vector(c2x, c1y),
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),
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CubicBezier(
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Vector(c2x, c1y),
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Vector(c2x, c1y),
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Vector(c2x, c2y),
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Vector(c2x, c2y),
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),
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CubicBezier(
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Vector(c2x, c2y),
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Vector(c2x, c2y),
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Vector(c1x, c2y),
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Vector(c1x, c2y),
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),
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CubicBezier(
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Vector(c1x, c2y),
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Vector(c1x, c2y),
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Vector(c1x, c1y),
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Vector(c1x, c1y),
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),
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)
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)
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return OpticalObject(contour_geometry, raytracing.material.BeamDump())
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def is_inside_document(self, ray: Ray) -> bool:
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return self.document_border.geometry.is_inside(ray)
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def get_material(
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obj: inkex.ShapeElement,
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) -> Optional[raytracing.material.OpticMaterial | BeamSeed]:
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"""Extracts the optical material of an object from its description"""
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desc = obj.desc
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if desc is None:
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desc = ""
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materials = get_materials_from_description(desc)
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if len(materials) == 0:
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return None
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if len(materials) > 1:
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raise_err_num_materials(obj)
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elif len(materials) == 1:
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return materials[0]
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def get_materials_from_description(
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desc: str,
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) -> list[raytracing.material.OpticMaterial | BeamSeed]:
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"""Run through the description to extract the material properties"""
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materials = list()
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class_alias = dict(
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beam_dump=raytracing.material.BeamDump,
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mirror=raytracing.material.Mirror,
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beam_splitter=raytracing.material.BeamSplitter,
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glass=raytracing.material.Glass,
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beam=BeamSeed,
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)
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for match in get_optics_fields(desc):
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material_type = match.group("material")
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prop_str = match.group("num")
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if material_type in class_alias:
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if material_type == "glass" and prop_str is not None:
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optical_index = float(prop_str)
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materials.append(class_alias[material_type](optical_index))
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else:
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materials.append(class_alias[material_type]())
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return materials
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def raise_err_num_materials(obj):
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inkex.utils.errormsg(
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f"The element {obj.get_id()} has more than one optical material and will be"
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f" ignored:\n{obj.desc}\n"
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)
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def get_geometry(obj: inkex.ShapeElement) -> GeometricObject:
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"""
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Converts the geometry of inkscape elements to a form suitable for the
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ray tracing module
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"""
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# Treats all objects as cubic Bezier curves. This treatment is exact
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# for most primitives except circles and ellipses that are only
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# approximated by Bezier curves.
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# TODO: implement exact representation for ellipses
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path = get_absolute_path(obj)
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composite_bezier = convert_to_composite_bezier(path)
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return composite_bezier
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def get_absolute_path(obj: inkex.ShapeElement) -> inkex.CubicSuperPath:
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path = obj.to_path_element().path.to_absolute()
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transformed_path = path.transform(obj.composed_transform())
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return transformed_path.to_superpath()
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def get_beams(element: inkex.ShapeElement) -> Iterable[Ray]:
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"""
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Returns a beam with origin at the endpoint of the path and tangent to
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the path
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"""
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bezier_path = convert_to_composite_bezier(get_absolute_path(element))
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for sub_path in bezier_path:
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last_segment = sub_path[-1]
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endpoint = last_segment.eval(1)
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tangent = -last_segment.tangent(1)
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yield Ray(endpoint, tangent)
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def convert_to_composite_bezier(
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superpath: inkex.CubicSuperPath,
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) -> CompoundGeometricObject:
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"""
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Converts a superpath with a representation
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[Subpath0[handle0_0, point0, handle0_1], ...], ...]
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to a representation of consecutive bezier segments of the form
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CompositeCubicBezier([CubicBezierPath[CubicBezier[point0, handle0_1,
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handle1_0, point1], ...], ...]).
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"""
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composite_bezier = list()
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for subpath in superpath:
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bezier_path = list()
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for (__, p0, p1), (p2, p3, __) in pairwise(subpath):
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bezier = CubicBezier(Vector(*p0), Vector(*p1), Vector(*p2), Vector(*p3))
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bezier_path.append(bezier)
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composite_bezier.append(CompoundGeometricObject(bezier_path))
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return CompoundGeometricObject(composite_bezier)
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def get_containing_layer(obj: inkex.BaseElement) -> inkex.Layer:
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try:
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return obj.ancestors().filter(inkex.Layer)[0]
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except IndexError:
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raise LayerError(f"Object '{obj.get_id()}' is not inside a layer.")
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class LayerError(RuntimeError):
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pass
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if __name__ == "__main__":
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Raytracing().run()
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